Columbian Catalog Grip-Seal Closure Envelopes, 10" x 13", White, 100 Per Box (CO925) A durable ALL-PURPOSE mailing envelope; ideal for mailing documents, catalogs, direct mail, promotional material, brochures and more Convenient and secure self-sealing Grip-Seal closure; simply peel off release strip and press down for a quick, secure seal Heavy-duty 28lb white wove material; open end closure; 10" x 13"; 100 envelopes per box; made in USA